yeah MILLION is unofficially their best charting album if not release
Seeing that as follows for them , albums wise
1) Rockin' the World (21.09.2011) #8
2) Just Do It (19.09.2012) #20
It's the singles in MILLION that're really pushing them a lot cos of the Gintama tie in , for Sakura Mitsutsuki & Genjyo Destruction